"""Formatting utilities for tool call display in the app.

This module handles rendering tool calls and tool messages for the TUI.

Imported at module level by `textual_adapter` (itself deferred from the startup
path). Heavy SDK dependencies (e.g., `backends`) are deferred to function bodies.
"""

import json
from collections.abc import Callable
from contextlib import suppress
from pathlib import Path
from typing import Any

from deepagents_code.config import MAX_ARG_LENGTH, get_glyphs
from deepagents_code.unicode_security import strip_dangerous_unicode

_HIDDEN_CHAR_MARKER = " [hidden chars removed]"
"""Marker appended to display values that had dangerous Unicode stripped, so
users know the value was modified for safety."""


def _format_timeout(seconds: int) -> str:
    """Format timeout in human-readable units (e.g., 300 -> '5m', 3600 -> '1h').

    Args:
        seconds: The timeout value in seconds to format.

    Returns:
        Human-readable timeout string (e.g., '5m', '1h', '300s').
    """
    if seconds < 60:  # noqa: PLR2004  # Time unit boundary
        return f"{seconds}s"
    if seconds < 3600 and seconds % 60 == 0:  # noqa: PLR2004  # Time unit boundaries
        return f"{seconds // 60}m"
    if seconds % 3600 == 0:
        return f"{seconds // 3600}h"
    # For odd values, just show seconds
    return f"{seconds}s"


def _coerce_timeout_seconds(timeout: int | str | None) -> int | None:
    """Normalize timeout values to seconds for display.

    Accepts integer values and numeric strings. Returns `None` for invalid
    values so display formatting never raises.

    Args:
        timeout: Raw timeout value from tool arguments.

    Returns:
        Integer timeout in seconds, or `None` if unavailable/invalid.
    """
    if type(timeout) is int:
        return timeout
    if isinstance(timeout, str):
        stripped = timeout.strip()
        if not stripped:
            return None
        try:
            return int(stripped)
        except ValueError:
            return None
    return None


def truncate_value(value: str, max_length: int = MAX_ARG_LENGTH) -> str:
    """Truncate a string value if it exceeds max_length.

    Returns:
        Truncated string with ellipsis suffix if exceeded, otherwise original.
    """
    if len(value) > max_length:
        return value[:max_length] + get_glyphs().ellipsis
    return value


def _sanitize_display_value(value: object, *, max_length: int = MAX_ARG_LENGTH) -> str:
    """Sanitize a value for safe, compact terminal display.

    Hidden/deceptive Unicode controls are stripped. When stripping occurs, a
    marker is appended so users know the value changed for display safety.

    Args:
        value: Any value to display.
        max_length: Maximum display length before truncation.

    Returns:
        Sanitized display string.
    """
    raw = str(value)
    sanitized = strip_dangerous_unicode(raw)
    display = truncate_value(sanitized, max_length)
    if sanitized != raw:
        return display + _HIDDEN_CHAR_MARKER
    return display


def _format_scope_path(
    path_value: object,
    abbreviate: Callable[[str], str],
) -> str:
    """Format a glob/grep `path` argument as a display suffix.

    The glob tool defaults `path` to the backend root (`"/"`); the grep tool
    defaults it to `None` (the backend's working directory). In either case the
    default scope adds no information and is omitted. Only an explicit, non-root
    path is rendered, so that two otherwise-identical calls scoped to different
    directories are distinguishable in the UI. The rendered path is shortened
    via the supplied `abbreviate` helper.

    Args:
        path_value: The raw `path` argument, or `None` when not supplied.
        abbreviate: Path-shortening helper from the calling scope.

    Returns:
        A suffix like ` in langchain`, or an empty string for the default scope.
    """
    if path_value is None:
        return ""
    raw = str(path_value)
    if raw in {"", "/"}:
        return ""
    sanitized = strip_dangerous_unicode(raw)
    display = abbreviate(sanitized)
    if sanitized != raw:
        display += _HIDDEN_CHAR_MARKER
    return f" in {display}"


def format_tool_display(tool_name: str, tool_args: dict) -> str:
    """Format tool calls for display with tool-specific smart formatting.

    Shows the most relevant information for each tool type rather than all arguments.

    Args:
        tool_name: Name of the tool being called
        tool_args: Dictionary of tool arguments

    Returns:
        Formatted string for display (e.g., "(*) read_file(config.py)" in ASCII mode)

    Examples:
        read_file(file_path="/long/path/file.py") → "<prefix> read_file(file.py)"
        web_search(query="how to code") → '<prefix> web_search("how to code")'
        execute(command="pip install foo") → '<prefix> execute("pip install foo")'
    """
    prefix = get_glyphs().tool_prefix

    def abbreviate_path(path_str: str, max_length: int = 60) -> str:
        """Abbreviate a file path intelligently - show basename or relative path.

        Returns:
            Shortened path string suitable for display.
        """
        try:
            path = Path(path_str)

            # If it's just a filename (no directory parts), return as-is
            if len(path.parts) == 1:
                return path_str

            # Try to get relative path from current working directory
            with suppress(
                ValueError,  # ValueError: path is not relative to cwd
                OSError,  # OSError: filesystem errors when resolving paths
            ):
                rel_path = path.relative_to(Path.cwd())
                rel_str = str(rel_path)
                # Use relative if it's shorter and not too long
                if len(rel_str) < len(path_str) and len(rel_str) <= max_length:
                    return rel_str

            # If absolute path is reasonable length, use it
            if len(path_str) <= max_length:
                return path_str
        except Exception:  # noqa: BLE001  # Fallback to original string on any path resolution error
            return truncate_value(path_str, max_length)
        else:
            # Otherwise, just show basename (filename only)
            return path.name

    # Tool-specific formatting - show the most important argument(s)
    if tool_name in {"read_file", "write_file", "edit_file"}:
        # File operations: show the primary file path argument (file_path or path)
        path_value = tool_args.get("file_path")
        if path_value is None:
            path_value = tool_args.get("path")
        if path_value is not None:
            path_raw = strip_dangerous_unicode(str(path_value))
            path = abbreviate_path(path_raw)
            if path_raw != str(path_value):
                path += _HIDDEN_CHAR_MARKER
            return f"{prefix} {tool_name}({path})"

    elif tool_name == "web_search":
        # Web search: show the query string
        if "query" in tool_args:
            query = _sanitize_display_value(tool_args["query"], max_length=100)
            return f'{prefix} {tool_name}("{query}")'

    elif tool_name == "grep":
        # Grep: show the search pattern, and the scoped path when non-default
        if "pattern" in tool_args:
            pattern = _sanitize_display_value(tool_args["pattern"], max_length=70)
            scope = _format_scope_path(tool_args.get("path"), abbreviate_path)
            return f'{prefix} {tool_name}("{pattern}"{scope})'

    elif tool_name == "execute":
        # Execute: show the command, and timeout only if non-default
        if "command" in tool_args:
            command = _sanitize_display_value(tool_args["command"], max_length=120)
            timeout = _coerce_timeout_seconds(tool_args.get("timeout"))
            from deepagents.backends import DEFAULT_EXECUTE_TIMEOUT

            if timeout is not None and timeout != DEFAULT_EXECUTE_TIMEOUT:
                timeout_str = _format_timeout(timeout)
                return f'{prefix} {tool_name}("{command}", timeout={timeout_str})'
            return f'{prefix} {tool_name}("{command}")'

    elif tool_name == "js_eval":
        # JS interpreter: show the first line of the snippet, truncated.
        code = tool_args.get("code")
        if isinstance(code, str) and code.strip():
            snippet = _sanitize_display_value(code, max_length=120)
            return f'{prefix} {tool_name}("{snippet}")'
        return f"{prefix} {tool_name}()"

    elif tool_name == "ls":
        # ls: show directory, or empty if current directory
        if tool_args.get("path"):
            path_raw = strip_dangerous_unicode(str(tool_args["path"]))
            path = abbreviate_path(path_raw)
            if path_raw != str(tool_args["path"]):
                path += _HIDDEN_CHAR_MARKER
            return f"{prefix} {tool_name}({path})"
        return f"{prefix} {tool_name}()"

    elif tool_name == "glob":
        # Glob: show the pattern, and the scoped path when non-default
        if "pattern" in tool_args:
            pattern = _sanitize_display_value(tool_args["pattern"], max_length=80)
            scope = _format_scope_path(tool_args.get("path"), abbreviate_path)
            return f'{prefix} {tool_name}("{pattern}"{scope})'

    elif tool_name == "fetch_url":
        # Fetch URL: show the URL being fetched
        if "url" in tool_args:
            url = _sanitize_display_value(tool_args["url"], max_length=80)
            return f'{prefix} {tool_name}("{url}")'

    elif tool_name == "task":
        # Task: show subagent type badge
        agent_type = tool_args.get("subagent_type", "")
        if agent_type:
            agent_type = _sanitize_display_value(agent_type, max_length=40)
            return f"{prefix} {tool_name} [{agent_type}]"
        return f"{prefix} {tool_name}"

    elif tool_name == "ask_user":
        if "questions" in tool_args and isinstance(tool_args["questions"], list):
            count = len(tool_args["questions"])
            label = "question" if count == 1 else "questions"
            return f"{prefix} {tool_name}({count} {label})"

    elif tool_name == "compact_conversation":
        return f"{prefix} {tool_name}()"

    elif tool_name == "write_todos":
        if "todos" in tool_args and isinstance(tool_args["todos"], list):
            count = len(tool_args["todos"])
            return f"{prefix} {tool_name}({count} items)"

    # Fallback: generic formatting for unknown tools
    # Show all arguments in key=value format
    args_str = ", ".join(
        f"{_sanitize_display_value(k, max_length=30)}="
        f"{_sanitize_display_value(v, max_length=50)}"
        for k, v in tool_args.items()
    )
    return f"{prefix} {tool_name}({args_str})"


def _format_content_block(block: dict) -> str:
    """Format a single content block dict for display.

    Replaces large binary payloads (e.g. base64 image/video data) with a
    human-readable placeholder so they don't flood the terminal.

    Args:
        block: An `ImageContentBlock`, `VideoContentBlock`, or `FileContentBlock`
            dictionary.

    Returns:
        A display-friendly string for the block.
    """
    if block.get("type") == "image" and isinstance(block.get("base64"), str):
        b64 = block["base64"]
        size_kb = len(b64) * 3 // 4 // 1024  # approximate decoded size
        mime = block.get("mime_type", "image")
        return f"[Image: {mime}, ~{size_kb}KB]"
    if block.get("type") == "video" and isinstance(block.get("base64"), str):
        b64 = block["base64"]
        size_kb = len(b64) * 3 // 4 // 1024  # approximate decoded size
        mime = block.get("mime_type", "video")
        return f"[Video: {mime}, ~{size_kb}KB]"
    if block.get("type") == "file" and isinstance(block.get("base64"), str):
        b64 = block["base64"]
        size_kb = len(b64) * 3 // 4 // 1024  # approximate decoded size
        mime = block.get("mime_type", "file")
        return f"[File: {mime}, ~{size_kb}KB]"
    try:
        # Preserve non-ASCII characters (CJK, emoji, etc.) instead of \uXXXX escapes
        return json.dumps(block, ensure_ascii=False)
    except (TypeError, ValueError):
        return str(block)


def format_tool_message_content(content: Any) -> str:  # noqa: ANN401  # Content can be str, list, or dict
    """Convert `ToolMessage` content into a printable string.

    Returns:
        Formatted string representation of the tool message content.
    """
    if content is None:
        return ""
    if isinstance(content, list):
        parts = []
        for item in content:
            if isinstance(item, str):
                parts.append(item)
            elif isinstance(item, dict):
                parts.append(_format_content_block(item))
            else:
                try:
                    # Preserve non-ASCII characters (CJK, emoji, etc.)
                    parts.append(json.dumps(item, ensure_ascii=False))
                except (TypeError, ValueError):
                    parts.append(str(item))
        return "\n".join(parts)
    return str(content)